告诉你什么是优雅的代码(6)------阿拉伯钱数转换为中文形式

编程技术  /  houtizong 发布于 3年前   75

http://www.iteye.com/topic/766812里谈到
题目： 将正整数的阿拉伯钱数转换为中文形式，如1011→一千零一十一，输出。

作者做得相当啰嗦，也比较低效，正好有缘遇到优雅代码大师区区在下，于是一段优雅代码得以诞生:

public class MoneyTrans {private static String[] ChinaDigit = {"零","一","二","三","四","五","六","七","八","九"};private static String[] UNIT = {"","","十","百","千"};private static String[] BIGUNIT = {"","万","亿","兆"};private static long MAX = 10000000000000000L - 1;private char[] digit;public String trans(long n) throws Exception{if(n > MAX){throw new Exception("数字过大，最多可处理到千兆位");}StringBuffer buff = new StringBuffer();boolean isPrePartZero = false;digit = String.valueOf(n).toCharArray();int length = digit.length;int pos = (length - 1)/4;int headLength = (length - 1)%4 + 1;//  xxxxxxxxxx -->  xx|xxxx|xxxxbuff.append(partTrans(0,headLength) + BIGUNIT[pos--]);for (int i = headLength;i < length ; i = i + 4) {String part = partTrans(i , i + 4);if(part.length() == 0){isPrePartZero = true;}else{if(isPrePartZero && !part.startsWith(ChinaDigit[0])){buff.append(ChinaDigit[0]);}buff.append(part +  BIGUNIT[pos]) ;isPrePartZero = false;}pos--;}return buff.toString();}private  String partTrans(int start, int end) {StringBuffer buff = new StringBuffer();boolean isPreDigitZero = false;for (int i = start; i < end; i++) {int cur = digit[i] - '0';if(cur != 0 ){if(isPreDigitZero){buff.append(ChinaDigit[0]);}buff.append(ChinaDigit[cur] + UNIT[end - i]);isPreDigitZero = false;}else {isPreDigitZero = true;}}return buff.toString();}public static void main(String[] args) throws Exception {MoneyTrans transtor = new MoneyTrans();    String money = transtor.trans(9000000000000000L);System.out.println(money);}}

结果：

九千兆